Yes, ready made soup is really expensive compared with the cost to make your own. Most of them are made from really low cost ingredients like pulses and cheaper vegetables like carrots, potatoes, leeks, onions, broccoli etc.
Plus even the posh fresh ones are disappointing compared with home made.
I often look at them in the supermarket and think they look nice but then remember I have a load of soup in the freezer that I made to use up bendy carrots etc.
If your DH is on board with the money saving he could batch cook soup, he could probably make enough to last a week for the cost of one carton of premade.
If you're not wasting food and most of what you eat doesn't look particularly expensive, it's probably the extras that's adding to the cost.
Premade cocktails are expensive, but a weekly bottle of prosecco wouldn't add hugely to the cost unless you're buying expensive brands. If you stocked up when supermarkets do the 25% off when you buy 6 bottles type offers, the cost should be about £25 a month, if that.
The fruit you're buying isn't particularly expensive, a banana costs around 10 to 15 p for example, so are they eating ridiculous amounts? A banana or an apple is 2 portions of fruit, so one of these a day is plenty. They could also snack on carrots as a cheap alternative.